|
Extracted from: TImberlake P. H., (1958). A Revisional Study of The Bees of the Genus Perdita F. Smith, with Special Reference to the Fauna of the Pacific Coast (Hymenoptera, Apoidea) Part III. University of California Press Berkeley and Los Angeles 1958, Volume 14, No. 5, pp. 303-410, plates 4-15. This species is distinguished from placida by the more obscurely punctured frons and the comparatively small and narrow pygidial plate. Female.—Head and thorax dark green, the propodeum more bluish. Mandibles except red tips, labrum, clypeus, and lateral marks creamy white; clypeus entirely light except the usual pair of dark dots and evanescent submedian stripes in the form of a faint brown dot on each side. Lateral marks rather abruptly narrowed below and intruding between foveae and eyes for a short distance. Supraclypeal area and subantennal plates black, the green descending almost to clypeus between subantennal plate and lateral mark on each side. Collar of pronotum, subinterrupted band on hind margin of disk, and tubercles pale yellow. Abdomen creamy white, with base of tergite 1, and broad bands at junction of tergites 1-2 to 4-5 blackish, the base of tergite 6 also partly infuscated. Light band on tergite 1 very narrow, interrupted medially, and subinterrupted on each side, the base of segment also narrowly white on lateral margins. Light band on tergite 2 no broader than the subsequent dark band and narrowed and curved backward at outer ends. Legs yellow, with a blotch on posterior side of front femora except apex, stripe on outer edge of front tibiae, short stripe on dorsal edge of middle femora, blotch on outer edge and posterior side of middle tibiae, and spot at apex of hind femora brownish, and the hind tibiae and tarsi fuscous. Antennae fuscous, becoming brownish yellow beneath, the scape clear yellow except a large triangular dark mark above. Tegulae pale yellow at base and hyaline on outer margin. Wings almost whitish hyaline, the nervures pale yellowish, margins of stigma a little darker and subcosta pale ferruginous except at base. Head large, but hardly broader than long. Mandibles stout, with the subdilated inner margin abruptly narrowed before the apex without forming a distinct inner tooth. Facial foveae moderately wide, reaching from level of middle of antennal Bockets nearly two thirds of distance to level of anterior ocellus. Pygidial plate as long as the basal width, the sides converging nearly straight to the moderately narrow and rounded apex, which bears a slight median notch. Frons strongly tessellate, rather dull, with fine, rather close punctures, which become more distinct between each fovea and adjacent antennal socket and somewhat sparser above but covering nearly the whole area in front of ocelli. Pubescence whitish, about normally developed for this group, becoming rather short, thin, and erect on mesonotum, without a prescutellar band of more appressed hair. Length, about 5 mm.; anterior wing, 3.8 mm. One female (holotype), Tumalo, Crook County, Oregon, Aug. 7, 1939 (K. Gray and Joe Schuh), in collection of the Citrus Experiment Station, Riverside.
|
